“ 
; 
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128 MISSOURI BOTANICAL GARDEN. 
ARIOCARPUS.* 
Plants simple or very rarely cespitose, depressed top- 
shaped. Tubercles imbricated, radiating from the crown 
they form a rosette, made up of two parts comparable to 
the blade and claw as exemplified in some flowers. The 
lower portion or claw is flattened and more or less 
appressed along the body of the plant, the upper part or 
blade is reflexed, consisting of a more or less pyramidal 
body whose upper surface is triangular in outline. The 
entire surface of the blade is covered with a tough carti- 
laginous coat. This covering, and the absence of spines, 
separate these plants from Mamillaria, to which they are 
commonly referred and to which they are more closely 
related than to any other genus. 
ARIOCARPUS FissURATUS (Engelm.) K. Sch. in Engler- 
Prantl’s Natiir. Pflanzenfamilien 8%:195. 1894. 
Mamillaria fissurata, Engelm. Syn. Cact. 270. 1856.— Watson, Cactus 
Culture 160. fig. G7. 1894. 
Anhalonium jissuratum, Engelm. Bot. Mex. Bound. 75, pl. 76. 1859.— 
L’Illustr. Hortic. 16:79. 7 fig. 1869. Férster’s Handb. Cact. 234. 
fig. 20. 1886 [ed. Riimpler].— Blanc, Catal. and Hints on Cacti 13. 
no. 2. 1888 [2nd ed.].— Baltimore Cactus Journ. 2: 247. Z jig. 
Jan. 1896, 
This species is perhaps the most common one in cultiva- 
tion, appearing in nearly every cactus lover’s collection. 
It is so characteristic and well defined in its structure that 
it is entirely unnecessary to dilate upon it, since what would 
be written could only be a repetition of the work of former 
authors. Our plate gives an accurate representation of 
its habit of growth as well as the characteristic detail 
structure of the tubercles. An excellent plate with detail 
drawings is given in Engelmann’s Botany of the Mexican 
Boundary. The portion of this plate showing the habit 
has been reproduced in the other publication cited above, 
* Scheidw. Bull. Acad. Royal Scien. Bruxel. 5: 491. 1838. Anha- 
lonium, Lem. Cact.1. 18389. 
